1. Section 3.2 Estimating Decimal Products and Quotients
Algebra Concepts
Section 3.2
Estimating Decimal Products and Quotients

2. Consider the problem ×4.
Can you do this problem without paper or a calculator?
Can you get an idea of what the answer would be?
6×4=24 𝑠𝑜 𝑡ℎ𝑒 𝑎𝑛𝑠𝑤𝑒𝑟 𝑖𝑠 ≈24. We also know the answer would be less than 24 because 5.86 < 6

3. Katie bought 5 picture frames on sale for $3. 70
Katie bought 5 picture frames on sale for $ The clerk charged her $ before tax. Should she question this?

4. When estimating quotients, work with numbers that are easy to divide mentally.
Compatible numbers- numbers that are easy to compute mentally

5. Is your estimate reasonable?
Divide 15.2÷3.95
Estimate the answer using compatible numbers
16÷4=4
Is 4 a good estimate?
Calculator answer …

6. Estimate
#1 396×2.3 #2 372÷9.8 # ÷2.76